Long-Term Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Long-term debt obligation
Total debt	$ 98,000,000	$ 110,250,000
Less current maturities	15,313,000	12,250,000
Total long-term debt	82,687,000	98,000,000
2010 Revolving Credit Facility, due August 12, 2013
Long-term debt obligation
Basis of interest rate	LIBOR	LIBOR
Total debt		0
Remaining borrowing capacity		60,500,000
2013 Revolving Credit Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	Eurodollar rate
Total debt	0
Remaining borrowing capacity	72,500,000
Effective rate of interest (as a percent)	2.42%
2011 Term Loan Facility, due August 16, 2016
Long-term debt obligation
Basis of interest rate	LIBOR	LIBOR
Total debt	$ 98,000,000	$ 110,250,000
Effective rate of interest (as a percent)	2.17%